Work

Rewiring Receptor Activation: Mechanistic Insights into Toggle Switch Modulation by 25CN-NBx Compounds

Year: 2025

Type: article

Abstract: The development of new treatments for neuropsychiatric disorders relies on a deeper understanding of the molecular mechanisms behind psychedelic compounds, particularly how they differentiate between hallucinogenic and antidepressant effects. In this study, we explore by molecular dynamics simulations a series of 25CN-NBx compounds bound to the 5-HT2A receptor. The simulations uncover that bulky substitutions on the N-benzyl ring cause a significant shift in the position of W336, a key toggle switch residue known to influence receptor activation and thought to play a crucial role in mediating psychedelic signaling. This result is confirmed through potential of mean force calculations along the toggle switch’s dihedral angle. End-state free energy calculations align closely with experimental data, showing that 25CN-NB-2-OH-3-Me and 25CN-NB-2-OH-5-MeO have the highest and lowest affinities, respectively, for the 5-HT2A receptor. Further analysis indicates that when W336 adopts its negative dihedral state, it establishes stronger van der Waals interactions, stabilizing its contacts with residues F332 and I163 — key players previously linked to receptor activation. Our findings provide a framework for understanding receptor activation and can be extended to other G protein-coupled receptors where the toggle switch is central to signal activation.

Source: Zenodo (CERN European Organization for Nuclear Research)

DOI: 10.5281/zenodo.15230074

Authors: Palmisano, Vito F., Vidal-Sánchez, Micaela, Nogueira, Juan J.

Institution: Universidad Autónoma de Madrid

Language: English

Topic: Receptor Mechanisms and Signaling

Subfield: Molecular Biology

Field: Biochemistry, Genetics and Molecular Biology

Domain: Life Sciences

SDG: Good health and well-being

Open Access status: green

Funders: Comunidad de Madrid, Agencia Estatal de Investigación